Model ion abundances for comet Halley

Details Model ion abundances for comet Halley Model ion abundances for comet Halley

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esla.sympr....h&link_type=abstract

Presented at the 20th ESLAB Symposium, Heidelberg, West Germany, 27 Oct. 1986

Physics

Abundance, Computerized Simulation, Halley'S Comet, Ions, Mass Spectroscopy, Mathematical Models, Solar Wind

Scientific paper

A computer model for comet comae has been applied to predict ion abundances for comet Halley. It is assumed that the volatile component of the nucleus is 85% water and that the remaining volatile molecules are composed of carbon, nitrogen, oxygen, and sulfur. Model parameters such as heliocentric distance, size, and albedo are chosen to be consistent with the 13 to 14 March 1986 encounter of the Giotto spacecraft with the comet. Photoprocesses, gas-phase chemical kinetics, coma energy balance including a separate electron temperature, multifluid hydrodynamics with a transition to free molecular flow, fast streaming atomic and molecular hydrogen, and counter and cross streaming of species in the coma-solar wind interaction are taken into consideration. A comparison of the model results is made with preliminary data from the ion mass spectrometer at 6000 and 1500 km from the nucleus. We find good overall agreement. The implication of the coma physics and chemistry is discussed.

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